fix: modernize nullresolve runtime

test/test.node.ts

@@ -1,4 +1,4 @@
-import { tap, expect } from '@push.rocks/tapbundle';
+import { tap, expect } from '@git.zone/tstest/tapbundle';
 
 import * as nullresolve from '../ts/index.js';
 
@@ -11,4 +11,4 @@ tap.test('should create, start and stop an instance of nullresolve', async () =>
   await nullresolveInstance.stop();
 });
 
-tap.start();
+export default tap.start();